Multiple crystal holder



M 17, 1949- R. J. BITNER 2,470,133

MULTIPLE CRYSTAL HOLDER Filed Dec. 16, 1946 HI mm mu mmmuui\\\ \....g

Patented May 17, 1949 MULTIPLE CRYSTAL HOLDER Robert J. Bitner, Kansas City, Mo., assignor to Gasket Engineering 00., Inc., Kansas City, Mo., a corporation of Missouri Application December 16, 1946, Serial No. 716,501

6 Claims.

This invention relates to crystal holders for radio circuits and has for its primary aim to provide means for supporting a number of crys tals in operative position where any one of the same may be utilized by inclusion in a circuit where the frequency of the crystal is a desirable or necessary adjunct to the function thereof.

One of the important objects of this invention is to provide a multiple crystal holder having means for the selection of any one of a number of crystals which means of construction is unique, positive in its operation and capable of maintaining quartz crystals in place where they are protected from destructive forces yet rendered selectively usable in response to the desire of the operator.

Minor objects of the invention are many and will become apparent during the following specification, referring to the accompanying drawing, wherein Fig, 1 is a side elevational view of a multiple crystal holder made pursuant to the present invention.

Fig. 2 is a longitudinal central sectional view taken on line IIII of Fig. 1.

Fig. 3 is a cross-sectional view taken on line III-III of Fig. 2.

Fig. 4 is a similar cross-sectional View taken on line IVIV of Fig. 2, and

Fig. 5 is a wiring diagram, illustrating the manner of including the crystals in the circuit for selectivity utilization.

The holder embodying my invention may be employed in any circuit where quartz crystals are to be used but where the temperature thereof is not a factor. In the form of the invention chosen for illustration, the numerals It, [2 and I4 designate sections of a body which sections are releasably held in stacked, superimposed assembled relation by a series of pins [6, anchored to base section Ill and extending upwardly through the intermediate or bearing section [2 and the uppermost section 14. The material from which these said sections [0, l2 and i4 is molded or otherwise formed should have electrical insulating properties and base section if) should be provided with a guide plug and a sufiicient number of prongs l8 to mount the holder in a socket where contact with the circuit with which the device is to be used, may be made. A bushing of brass or such metal as will have electrical conducting properties is fitted into the hollow guide plu I6, as illustrated in Fig. 2 and a connection through a wire or the like 22 is made between bushing 20 and one of the prongs 18.

Section ID of the body has a shoulder 24 provided thereon to receive a metallic protecting cap 26, having an axial opening 28 therein for the passage of an operating shaft 3!]. This shaft 3i] carries any suitable means for turning the same about its axis (not here shown) and the lower end of shaft 38 is journaled in bushing 20.

Intermediate section H has a boss portion 32 provided with a central bore 34 through which the intermediate part of shaft 30 projects. A split washer 36 engages an annular groove 38 in shaft 30 at a point shown in Fig. 2 and when this split washer 36 is in place, it bears against a portion of section [2 to prevent longitudinal displacement.

A radially extending arm 40 carried by shaft til rests upon the upper end of boss 32 to cooperate with split washer 36 in preventing this longitudinal accidental displacement of the shaft 39. A contact plate 42 carried by section l2 on the underside thereof is joined by any suitable conductor 44 to one of the pin l8. This plate 42 is also connected electrically to a metal block 55, circumscribing boss 32 in a manner clearly shown in Fig. 4. This block 45 is polygonal and in the instance illustrated, has four fiat sides.

Section M is shaped as shown in Fig. 4 to present four fiat sides lined with contact plates 48 in opposite parallel relation with the flat sides of block 45. These plates have overhanging lips Bil that lie in the path of travel of the free end of arm and when this arm is actuated by the rotation of shaft to this free end will successively engage the lips 59 to cause the crystal lying between the associated plate 48 and block 46 to be brought into the electrical circuit for the purpose of employing its frequency. A number of wells 52 results from the construction just set forth and it is in these wells between block 46 and plate 58 that the several crystals are mounted.

The wiring diagram illustrated in Fig. 5 clearly shows the manner in which the crystals are selected by moving arm 48. The structure just about set down indicates the manner in which the crystal holder may be made by the utilization of parts capable of being assembled with a minimum amount of time and expense. The crystals are readily available and, therefore, quickly replaceable or renewable by merely withdrawin ca 26 from its threaded engagement with section 12.

Havin thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. In a multiple crystal holder, a body of insulating material provided with a plurality of wells for the reception respectively of the crystal units; a contact plate of conducting material in each well respectively at one side thereof; a member of conducting material forming another side of each said well and being common to all thereof, said contact plate and the member of conducting material being in engagement with the crystal in the wells respectively at spaced apart points and an arm mounted for movement about an axis of rotation and into successive contact with the contact plates of the wells to selectively introduce the crystals into a circuit to utilize their respective frequencies, said arm and the block being always a part of the said circuit.

2. In a multiple crystal holder, a body of insulating material provided with a plurality of wells for the reception respectively of the crystal units; a contact plate of conducting material in each well respectively at one side thereof; a member of conducting material forming another side of each said well and being common to all thereof, said contact plate and the member of conducting material being in engagement with the crystal in the wells respectively at spaced apart points and an arm mounted for movement about an axis of rotation and into successive contact with the contact plates of the wells to selectively introduce the crystals into a circuit to utilize their respective frequencies, said arm and the block being always a part of the said circuit, said wells being disposed in a pattern circumscribing the axis of rotation of the arm.

3. In a multiple crystal holder, a sectional body of insulating material; a series of stationary contact plates of conducting material arranged in pairs and carried by the body for the reception of crystals engaged therebetween; a lip on one plate of each pair respectively; a rotatable arm of conductible material disposed to successively engage the lips upon movement thereof about its axis; and conductors for connecting the arm and said other plate of each pair thereof in circuit for selective utilization of the crystals upon shifting the arm.

4. In a multiple crystal holder, a sectional body of insulating material; a series of contact plates of conducting material arranged in pairs and carried by the body for the reception of crystals therebetween; a lip on one plate of each pair respectively; a rotatable arm of conductible material disposed to successively engage the lips upon movement thereof about its axis; and conductors for connecting the arm and said other plate of each pair thereof in circuit for selective utilization of the crystals upon shifting the arm, one section of said body having a shaft journaled '4 therein to operably support the arm, said shaft being one of the conductors and having electrical connection with the arm.

5. In a multiple crystal holder, a sectional body of insulating material; a series of contact plates of conducting material arranged in opposed pairs and carried by the body for the reception of crystals therebetween; a lip on one plate of each pair respectively; a rotatable arm disposed to successively engage the lips upon movement thereof about its axis; and conductors for connecting the arm and said other plate of each pair thereof in circuit for selective utilization of the crystals upon shifting the arm, one section of said body having a shaft journaled therein to operably support the arm, the contact plates on one side of the crystals circumscribing said shaft and being insulated therefrom.

6. In a multiple crystal holder, a sectional body of insulating material; a series of contact plates of conducting material arranged in pairs and carried by the body for the reception of crystals therebetween; a lip on one plate of each pair respectively; a rotatable arm disposed to successively engage the lips upon movement thereof about its axis; and conductors for connecting the arm and said other plate of each pair thereof in circuit for selective utilization of the crystals upon shifting the arm, said sections being in superimposed, stacked relation, one of the sections having a shaft of conducting material journaled therein to operably support the arm, said one section having one contact plate of each pair thereof mounted thereon, another section of the body having the other contact plates of each pair thereof mounted thereon, a third section of the body being equipped with pins extending through the first and second mentioned sections to maintain all sections of the body in operative relation with the contact plates of the pairs thereof in opposed relation for receiving the crystals therebetween.

ROBERT J. BITNER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,639,817 Taylor Aug. 23, 1927 1,654,189 Powell Dec. 27, 1927 1,663,682 Crossley et al Mar. 27, 1928 2,271,200 Mason Jan. 27, 1942 2,410,193 Bach Oct. 29, 1946 

